Side A stays in even when fader is set to Side B

Hello - we have been using MIXVIBES within church services for some time… we started with the free version which work great for a while! Then had an issue where the Side A would stay in even when the fader was set to Side B.
We purchased the paid version of MIXVIBES and it worked correctly for the last 4 months… then this morning we had the same issue with Side A staying in even when fader is set to Side B.
Any suggestions on how to fix this would be much appreciated!
Thanks in advance!
Derek
We purchased the paid version of MIXVIBES and it worked correctly for the last 4 months… then this morning we had the same issue with Side A staying in even when fader is set to Side B.
Any suggestions on how to fix this would be much appreciated!
Thanks in advance!
Derek